In existential sentences, some grammarians consider 'there' the grammatical subject and the noun phrase the notional subject; others simply call the noun phrase the subject and 'there' 'existential there'.
Hi Teachers, Could you help me with this one too? In this sentence, 'How many tickets is Caroline going to buy for the concert?' The subject is 'Caroline', isn't it? And 'tickets' is the direct object of the verb 'buy'. Am I right?